1 /* Invoking main from __libc_start_main. nptl version.
2 Copyright (C) 1998-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <atomic.h>
20 #include <pthreadP.h>
21
22 _Noreturn static void
__libc_start_call_main(int (* main)(int,char **,char ** MAIN_AUXVEC_DECL),int argc,char ** argv,ElfW (auxv_t)* auxvec)23 __libc_start_call_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
24 int argc, char **argv
25 #ifdef LIBC_START_MAIN_AUXVEC_ARG
26 , ElfW(auxv_t) *auxvec
27 #endif
28 )
29 {
30 int result;
31
32 /* Memory for the cancellation buffer. */
33 struct pthread_unwind_buf unwind_buf;
34
35 int not_first_call;
36 DIAG_PUSH_NEEDS_COMMENT;
37 #if __GNUC_PREREQ (7, 0)
38 /* This call results in a -Wstringop-overflow warning because struct
39 pthread_unwind_buf is smaller than jmp_buf. setjmp and longjmp
40 do not use anything beyond the common prefix (they never access
41 the saved signal mask), so that is a false positive. */
42 DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overflow=");
43 #endif
44 not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf);
45 DIAG_POP_NEEDS_COMMENT;
46 if (__glibc_likely (! not_first_call))
47 {
48 struct pthread *self = THREAD_SELF;
49
50 /* Store old info. */
51 unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
52 unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup);
53
54 /* Store the new cleanup handler info. */
55 THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf);
56
57 /* Run the program. */
58 result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
59 }
60 else
61 {
62 /* Remove the thread-local data. */
63 __nptl_deallocate_tsd ();
64
65 /* One less thread. Decrement the counter. If it is zero we
66 terminate the entire process. */
67 result = 0;
68 if (! atomic_decrement_and_test (&__nptl_nthreads))
69 /* Not much left to do but to exit the thread, not the process. */
70 while (1)
71 INTERNAL_SYSCALL_CALL (exit, 0);
72 }
73
74 exit (result);
75 }
76